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x - y = -1 -
x = 5
x - y = -1
5 - y =-1
y = 5+1=6
x,y =(5,6)
atau : 2x + y = 4
x - y = -1 +
3x = 3
x=1
2x + y = 4
2(1) + y = 4
y = 2